Notching unit



May 8, 1956 E. F. PAXHlA ETAL 2,744,575

NOTCHING UNIT Filed Jan. 4, 1954 2 Sheets-Sheet 1 IN V EN TORS J. METZGER TE A 7'7'OR/VE VS.

and A WV May 8, 1956 E. F. PAXHIA ETAL 2,744,575

uo'rcnmc UNIT Filed Jan. 4, 1954 2 Sheets-Sheet 2 INVENTORS EMANUEL EPAxH/A, RA YMOND J. METZGE'R anoL YABIIYV 6. WHITE @1140, M, My @474,

A 7'7'ORNEYS.

NOTCHING UNIT Emanuel F. Paxhia, Tonawanda, Raymond J. Metzger,

Cheektowaga, and Lynn G. White, Kenmore, N. Y., assignors, by mesne assignments, to Toolset, Incorporated, Buflalo, N. Y., a corporation of New York Application January 4, 1954, Serial No. 401,962 3 Claims. (Cl. 164-50) This invention relates to apparatus for notching sheet material and particularly to a self-contained, unitary device including cooperating notching punch and die means for use in a convention punch press or the like.

Self-contained sheet notching units of this general class are not broadly new, but the apparatus of the present invention provides a more eifective, useful and economical notching apparatus from the standpoints of economy and simplicity of manufacture, low cost and time saving maintenance and servicing, including grinding and replacement of worn parts, and more rigidly and accurately guided parts, the latter also contributing to longer life and cleaner, more accurate notching.

A number of other objects and advantages of the notching apparatus of the present invention will be apparent to those skilled in' this art from a consideration of the accompanying drawing and the following detailed description of one specific embodiment thereof. How- United States Patent.

ever, it is to be understood that such specific embodiment 3 is set forth by way of example only and the principles of the invention may be variously applied. The scope of the present invention is accordingly limited only as defined in the appended claims.

In the drawings:

Fig. 1 is a longitudinal cross-sectional view through one form of the apparatus of the present invention taken approximately on the line II of Fig. 2;

Fig. 2 is a top plan view of the notching apparatus of Fig. l; and

Fig. 3 is a cross-sectional view of the line III--III of Fig. 1.

Like characters of reference denote like parts in the several figures of the drawings and the numeral 10 designates a base frame member for rigidly supporting the notching die unit and for providing vertically guided support for the notching punch portion of the device.

Base 10 has a fiat die receiving surface 11 at its front portion and a pair of upstanding spaced side wall portions 12 and 13 which extend upwardly from the rear portion thereof. In the present instance the notching die elements themselves comprise side blocks 14 and 15 and a front block 16 which are screwed and doweled to the surface 11 of base 10 to form a female die comprising three sides of a square or rectangular figure which may be employed to form a variety of square-cornered notches in a manner which will be well understood by those skilled in this art.

The numeral 20 designates generally a vertically reciprocable punch holder which comprises a front portion 21 having a hardened steel male punch insert 22 screwed and doweled to its lower surface in registry with the opening formed by the die blocks 14, 15 and 16 for notching cooperation therewith upon vertical reciprocation of the punch holder 20.

The rear portion of holder 20 comprises a reduced width shank portion 25 having hardened steel vertically extending lateral wear plates 26 and 27 screwed thereto.

The overall width of shank 25 with its wear plates 26 and 27 is such as to provide vertical sliding fit of the punch holder 20 in the space formed between side wall 12 and 13 of the notching die base member 10.

The rear faces of side walls 12 and 13 of base member 10 are provided with vertically extending wear plates 30 and 31 which are screwed thereto as shown in Fig. 2 and a detachable retaining plate 32 is secured to the rear face of shank member 25 of punch holder 20 whereby its marginal portion have vertical sliding bearing against wear plates 30 and 31.

Similar vertical wear plates 35 and 36 are secured to the front surface of side wall 12 and 13 of base member 10 and the front punch holding portion 21 of punch holder 20, which in the present instance is of substantially greater width than shank portion 25, is arranged to have its rear marginal surfaces bearing against wear plates 35 and 36 for vertical sliding bearing.

It will be seen from the foregoing that punch holder 20 is accurately and rigidly guided for vertical movement relative to and upon base member 10 with all of the vertical intersliding surfaces including removable and replaceable wear plates which may be of hardened steel, bronze, or other desirable bearing and wear-resisting material.

Referring to Fig. 1, the shank portion 25 of punch holder 20 has a recess 40 in its bottom surface which receives, in the present instance, a pair of compression coil springs 41 which hear at their lower ends against a transverse wall portion 42 of base member 10 to urge punch holder 20 to the upper limit position shown in dotand-dash lines at the upper portion of Fig. l. Upward movement of the punch holder 20 under the impetus of springs 41 is limited by a top bridge or retaining plate 44 which is screwed at its opposite lateral marginal portions to the upper faces of side walls 12 and 13 of base member 10.

The lower portion of base member 10 is formed to provide an inclined discharge chute 43 for discharging scrap material. Base member 10 is further provided with a pair of locating pins 44 and 45 for cooperation with a locating templet or similar locating device in a manner which is well known in this art. As shown in Figs. 1 and 2, base member 10 is further provided with lugs 46, 47 and 48 which receive screws or bolts for fastening the notching unit to a punch press, bolster plate or similar work surface.

The normal unstressed position of punch holder 29 is in the dot-and-dash line position shown in Fig. l at the upper portion thereof. Impingement of the ram or slide of a press against the upper surface of the front portion 21 of punch holder 20 moves the same downwardly for notching operations in a manner which is well known in this art.

The manner in which various gaging arrangements may be set up to effect square corner notches of various sizes and rectangular notches along the edges of a work sheet will likewise be obviousto those skilled in this art without further discussion.

Where notches are to be made along the edge of a work sheet, as distinguished from corner notches, means may be provided for stripping the work sheet from the notching punch. Such strippers may readily be mounted against opposite sides of the front portion 21 of punch holder 20.

What is claimed is:

l. Unitary sheet materials notching apparatus for use between the bed and ram of a press comprising a base member including a front notching die portion and a pair of upstanding side walls rearwardly thereof, a punching member including a front notching punch portion in vertical registry with the notching die portion and a rearward shank portion of less width than the front notching punch portion, said shank portion being guided for vertical movement between said upstanding side walls, the marginal portions of therear of said notching punch portion having sliding bearing against the front surfaces of the upstanding side walls, a retaining; memberfixed tothe rear of said shank portion and having: lateral projecting portions for vertical sliding bearing against the rear surfaces of said upstanding side walls, said front notching punch portion extending upwardly beyond said upstanding side walls for engagement by a press ram, said base member having an abutment portion underlying the shank portion of the punching member comprising an integral transverse connection between said upstanding side walls, and compression coil spring means acting between said abutment and said shank portion to retain the punching member yieldably in elevated position, said base member being open at the lower portion of its rear side and'having a discharge chute extending rearwardly from-said notching die portion and beneath said abutment portion 2. Unitary sheet material notching apparatus for use between the bed and-ram of apress comprising a base member including a front notching die portion and a pair of upstanding side walls rearwardly thereof, a punching member including a front notching punch portion in vertical registry with the notching die portion and a rearward shank portion of less width than the front notching punch portion, said front notching punch portion extending upwardly beyond said upstanding side walls for engagement by a press ram, one of said members having a pair of detachable vertical wear plates whereby said shank portion is guided for vertical movement between said upstanding sidewalls, wear plates between the marginal portions of the rear ofsaid notching punch portion and the front surfaces of the upstanding side walls anddetachably secured to one of said members, a retaining member fixed to the rear of said shank portion, and wear plates between the lateral projecting portions of said retaining member and the rear surfaces of said upstanding side walls to provide sliding bearing therebetween, said base member being open at the lower 1 portion of its rear side and having a discharge chute 3. Unitary sheet material notching Ab slithfibfinc between the bed and ram of a press comprising a base member including a front notching die portion and a pair of upstanding side walls rearwardly thereof, a punching member including a front notching punch portion in vertical registrywit h the notching die portion and a rearward shank portion of less width than the front notching punch portion, saidfront notching punch portion,cxtending upwardly beyond said upstanding side walls for engagement by a press, ram, one of said members having a pairof detachable vertical wear plates whereby said shank portion is guided for vertical movement between said upstanding side walls, wear plates between the marginal portions of,the rear of said notching punch portion and the front surfaces of the upstanding side walls and detachably secured to one of said members, a retaining member fixed to the rear of said. shankportion, and wear plates between the lateral projecting portions of said retaining member and the rear surfaces of said upstanding side walls to provide sliding bearing therebetween, said base member having an abutment portion underlying the shank portion of the punching member comprising an integral transverse connection between said upstanding side walls, and compression coil spring means acting between said abutment and said shank portion to retain the punching member yieldably in elevated position, said base member being open at the lower portionof-its-rear side and having a discharge chute extending rearwardly from said notching die portion and between said abutment portion.

References .Cited in the file: ot this patent UNITED STATES PATENTS 

